Upgrade KML, LIBKML, GPX, GML, VRT, GeoJSON, FileGDB, EDIGEO, OSM and GeoRSS drivers to set SRS on geom field defn rather than on layer (RFC 41)

git-svn-id: https://svn.osgeo.org/gdal/trunk@26448 f0d54148-0727-0410-94bb-9a71ac55c965